NEW: The Ultimate Guide to BarCodes If you ever wonder why I don't post daily it is because what should be simple is often incredibly complicated and all the research takes a lot of my time. I then publish the results so others don't have to reinvent the wheel. If you sell products - this post is important to you. Amazon has recently started requiring UPC codes for products listed for sale. UPDATE January 11, 2017. Erik Quivers made us aware of the following issue that barcode buyers … [Read more...]